Answer:
He has
number of points
Step-by-step explanation:
We have given that numbers from 3 to 9
So numbers will be 3,4,5,6,7,8,9
Here prime numbers are 3,5,7
And composite numbers are 4,6,8,9
So probability of getting prime number = ![\frac{3}{7}](https://tex.z-dn.net/?f=%5Cfrac%7B3%7D%7B7%7D)
And probability of getting composite number ![=\frac{4}{7}](https://tex.z-dn.net/?f=%3D%5Cfrac%7B4%7D%7B7%7D)
It is given that if he gets prime number then he get 1 point and if he get composite number then he loss 1 point '
So value of number of point he has = ![1\times \frac{3}{7}-1\times \frac{4}{7}=\frac{-1}{7}](https://tex.z-dn.net/?f=1%5Ctimes%20%5Cfrac%7B3%7D%7B7%7D-1%5Ctimes%20%5Cfrac%7B4%7D%7B7%7D%3D%5Cfrac%7B-1%7D%7B7%7D)